[Shujin]

I think this weapon wouldn´t be THAT over bearing if the other Katanas actually got in line with the scaling of it...All of those swords are 7 star weapons so I guess you should sorta expect them to be good. The main problem here is that the Lightning Katana is the only one that scales with Ski and that even better than the Ice katana, which makes no sense.
Maybe we change the Katanas scaling generally to this:
40% Ski scaling
60% Element stat scaling

For Akujin since it´s a defensive stat 30% Res and shove the other 30% to Strength? or even skill, I kinda feel that weapon deserved it more than Raijin cause Darkness is a universally resisted stat, so it would be fine.

And if 100% Skill scaling for a single weapon is to much even when I feel like it would still be fine. push 30% of the elemental scaling to Ski to make it 70% and the last 30% into....I don´t know Will? Str? ...I personally prefer will cause else it would just be an icy hakouhen.